Battery: 9VBattery(not included) Features: Automatically and quickly finds correct breaker or fuse. Quickly and easy identifies conditions of circuit socket. Suitable for renovation, installation and acceptance of power grid in home, office and factory Buzzers and lights, flashlight lighting function, battery low voltage alarm Warning: Please caution extremely when use the MS5902 in the gigantic circuit breaker ark. Don't use when voltage more than 120V/230V AC.You can turn on the flashlight in the dark surroundings. Specifications: Type: Circuit Breaker Finder Material: Plastic Color: Black Size(L*W*H): About 198x40x50mm Plug: EU, US EU Voltage: 220V US Voltage: 110V Operating Voltage:AC220V/50HZ Operating Temperature: 0 ~ 50 Security Rating:IEC1010-1 CATII 600V Battery: 9VBattery(not included) Operation: Locating a circuit breaker or fuse Keep the pillar at left on the MS5902-T Plug the MS5902-T into the receptacle.If there is a candescent lightfixture,please install a socket adapter before make sure the switch isOFF.Then plug the MS5902-T into the socket adapter, turn the switch on at one time.(Socket adapter need purchase additional) Go to the circuit breaker panel box. Turn the MS5902-R on,the red LED is light. Place the chapiter of the MS5902-R directly onto the circuit breaker or fuse. Slide the chapiter of the MS5902-R down each breaker along both sides of the panel . Then the MS5902-R will beep frequently as it denote the relative signal strength. Move the MS5902-R down each breaker once more. On the third pa, the MS5902-R willbeep , the red LED will quench and the green LED will light only at the circuit Breaker powering the MS5902-T. Push the breaker off and check that the LED on the MS5902-T in the outlet is off to confirm you have found the correct breaker or buse. Test Socket:Keep the pillar at right on the MS5902-T. Please contradistinguish nameplate on the MS5902-T. Maintenance: Keep clean with a dry cloth. When the yellow LED is light on the MS5902-R, please unscrew andremove cover, insert 9V battery so as to the MS5902-R is well-balanced. Package Included: 1pc x Circuit Breaker Finder 1pc x Receiver Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.